K447A + GH4169惯性摩擦焊接头组织与高温力学性能

张传臣; 张田仓; 赵春玲

doi:10.12073/j.hjxb.2019400275

K447A + GH4169惯性摩擦焊接头组织与高温力学性能

1.
中国航空制造技术研究院航空焊接与连接技术航空科技重点实验室，北京　100024
2.
中国航发湖南动力机械研究所，株洲　412002

详细信息

作者简介:
张传臣，男，1981年出生，博士，高级工程师. 主要从事摩擦焊理论及工艺研究. 发表论文10余篇. Email：zhangchuanchen@sohu.com

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出版历程
- 收稿日期: 2018-04-07
- 网络出版日期: 2020-07-12
- 刊出日期: 2019-09-30

Microstructure and high temperature mechanical properties of inertia friction welding joint of K447A + GH4169

1.
AVIC Manufacturing Technology Institute, Aeronautical Key Laboratory for Welding and Joining Technologies, Beijing 100024, China
2.
AECC Hunan Aviation Powerplant Research institute, Zhuzhou 412002, China

摘要

摘要: 针对新型镍基铸造高温合金K447A和变形高温合金GH4169异种材料惯性摩擦焊工艺进行研究，对热处理后接头微观组织和高温力学性能进行试验分析，结果表明，K447A和GH4169惯性摩擦焊接头飞边成形良好，飞边根部无明显缺陷存在；接头焊缝区组织为完全再结晶组织，焊缝组织中的γ''和γ'相热处理后重新弥散析出，K447A侧仅形成了3 ~ 10 μm宽的再结晶区；通过接头高温力学性能试验，结果表明，接头高温拉伸和高温扭转性能断裂位置在K447A母材侧，400 ℃高周疲劳强度达到355 MPa. 在最大应力720 MPa，试验温度400 ℃条件下低周疲劳寿命均超过30 000次.
- 异种高温合金 /
- 惯性摩擦焊 /
- 组织 /
- 高温性能
Abstract: The dissimilar materials of Ni-base cast superalloy K447A and Ni-base wrought superalloy GH4169 were welded by Inertia Friction Welding (IFW). The microstructure and high temperature mechanical properties of the joints were studied after heat treatment. The results show that good flash can be formed after IFW and no clear defects were found at the root of the flash. Fine recrystallization zone was formed in the weld zone (WZ) and fine γ'' phase and γ' phase were precipitated in the WZ after heat processing. The recrystallization zone width of the K447A side is between 3μm and 10μm. The high temperature tensile strength and torsional strength of GH4169 + K447A IFW joints were equal to K447A base metal. The high cycle fatigue strength of the joint is 355 MPa at the temperature of 400 °C. Under the condition of 400 °C and 720 MPa, the low cycle fatigue life of all the joint samples exceeded 30 000 times.
- dissimilar superalloys /
- inertia friction welding /
- microstructure /
- high temperature mechanical property

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图 1 K447A基体组织形貌

Figure 1. Microstructure of K447A alloy

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图 2 GH4169基体组织形貌

Figure 2. Microstructure of GH4169 alloy

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图 3 K447A + GH4169惯性摩擦接头宏观形貌

Figure 3. Macro photograph of K447A + GH4169 IFW joints

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图 4 K447A + GH4169惯性摩擦焊焊缝区显微组织形貌

Figure 4. Microstructure of K447A + GH4169 IFW WZ

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图 5 K447A + GH4169惯性摩擦焊接头热力影响区显微组织

Figure 5. Microstructure of K447A + GH4169 IFW TMAZ

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图 6 K447A + GH4169惯性摩擦焊接头拉伸试样

Figure 6. Tensile sample of K447A + GH4169 IFW joints

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图 7 K447A + GH4169惯性摩擦焊接头高周疲劳试样

Figure 7. High cycle fatigue sample of IFW joints

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图 8 K447A + GH4169惯性摩擦焊接头低周疲劳试样

Figure 8. Low cycle fatigue sample of IFW joints

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图 9 接头低周疲劳断口形貌

Figure 9. Low cycle fatigue sample fracture of IFW joint

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图 10 K447A + GH4169惯性摩擦焊接头扭转试样

Figure 10. Torsion test sample of IFW joints

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表 1 K447A + GH4169惯性摩擦焊接头拉伸性能

Table 1 Mechanical property of K447A + GH4169 IFW joints

温度T/℃	抗拉强度R_m/MPa	屈服强度R_{p_0.2}/MPa	断面收缩率A(%)	断后伸长率Z(%)
400	1 014.5	960	2.5	4.4
650	1 009.4	877.6	3.3	4.5

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表 2 K447A + GH4169惯性摩擦焊接头低周疲劳性能

Table 2 Low cycle fatigue property of IFW joints

编号	最大应力σ/MPa	寿命N(次)
1	720	30 000
	780	30 000
	840	9 992
2	720	30 000
	780	30 000
	840	27 088
3	720	30 000
	780	30 000
	840	6 741
4	720	30 000
	780	30 000
	840	30 000
	900	8 546
5	720	30 000
	780	30 000
	840	3 008
6	720	30 000
	780	30 000
	840	30 000
	900	18 843
7	720	30 000
	780	30 000
	840	30 000
	900	11 309
8	720	30 000
	780	30 000
	840	30 000
	900	9 934
9	720	34 825
10	720	150 661

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参考文献(12)

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